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<a href="thread__scan_8cuh.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/******************************************************************************</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * Copyright (c) 2011, Duane Merrill.  All rights reserved.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * Copyright (c) 2011-2013, NVIDIA CORPORATION.  All rights reserved.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> * </span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> * Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * modification, are permitted provided that the following conditions are met:</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> *     * Redistributions of source code must retain the above copyright</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> *       notice, this list of conditions and the following disclaimer.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> *     * Redistributions in binary form must reproduce the above copyright</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment"> *       notice, this list of conditions and the following disclaimer in the</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment"> *       documentation and/or other materials provided with the distribution.</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment"> *     * Neither the name of the NVIDIA CORPORATION nor the</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment"> *       names of its contributors may be used to endorse or promote products</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment"> *       derived from this software without specific prior written permission.</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment"> ******************************************************************************/</span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="preprocessor">#pragma once</span></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="preprocessor">#include &quot;../thread/thread_operators.cuh&quot;</span></div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="preprocessor">#include &quot;../util_namespace.cuh&quot;</span></div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;CUB_NS_PREFIX</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="keyword">namespace </span>cub {</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="keyword">template</span> &lt;</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;    <span class="keywordtype">int</span>         LENGTH,</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;    <span class="keyword">typename</span>    T,</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    <span class="keyword">typename</span>    ScanOp&gt;</div>
<div class="line"><a name="l00066"></a><span class="lineno"><a class="code" href="group___thread_module.html#ga37fa2b0ca9bb32096517480e98894545">   66</a></span>&#160;__device__ __forceinline__ T <a class="code" href="group___thread_module.html#ga37fa2b0ca9bb32096517480e98894545" title="Perform a sequential exclusive prefix scan over LENGTH elements of the input array, seeded with the specified prefix. The aggregate is returned. ">ThreadScanExclusive</a>(</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;    T           *input,                 </div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    T           *output,                </div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;    ScanOp      scan_op,                </div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;    T           prefix,                 </div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;    <span class="keywordtype">bool</span>        apply_prefix = <span class="keyword">true</span>)    </div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;{</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;    T inclusive = input[0];</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    <span class="keywordflow">if</span> (apply_prefix)</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;    {</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;        inclusive = scan_op(prefix, inclusive);</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    }</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;    output[0] = prefix;</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    T exclusive = inclusive;</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;<span class="preprocessor">    #pragma unroll</span></div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;<span class="preprocessor"></span>    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 1; i &lt; LENGTH; ++i)</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    {</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;        inclusive = scan_op(exclusive, input[i]);</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;        output[i] = exclusive;</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;        exclusive = inclusive;</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;    }</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;    <span class="keywordflow">return</span> inclusive;</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;}</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;<span class="keyword">template</span> &lt;</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;    <span class="keywordtype">int</span>         LENGTH,</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;    <span class="keyword">typename</span>    T,</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;    <span class="keyword">typename</span>    ScanOp&gt;</div>
<div class="line"><a name="l00104"></a><span class="lineno"><a class="code" href="group___thread_module.html#ga145ad5e3b05134aef8d86f84df9c25b8">  104</a></span>&#160;__device__ __forceinline__ T <a class="code" href="group___thread_module.html#ga37fa2b0ca9bb32096517480e98894545" title="Perform a sequential exclusive prefix scan over LENGTH elements of the input array, seeded with the specified prefix. The aggregate is returned. ">ThreadScanExclusive</a>(</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;    T           (&amp;input)[LENGTH],       </div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;    T           (&amp;output)[LENGTH],      </div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;    ScanOp      scan_op,                </div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;    T           prefix,                 </div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    <span class="keywordtype">bool</span>        apply_prefix = <span class="keyword">true</span>)    </div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;{</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;    <span class="keywordflow">return</span> ThreadScanExclusive&lt;LENGTH&gt;((T*) input, (T*) output, scan_op, prefix);</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;}</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;<span class="keyword">template</span> &lt;</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;    <span class="keywordtype">int</span>         LENGTH,</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;    <span class="keyword">typename</span>    T,</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;    <span class="keyword">typename</span>    ScanOp&gt;</div>
<div class="line"><a name="l00126"></a><span class="lineno"><a class="code" href="group___thread_module.html#ga4004b2a6bfb2b4f024b0389e9c46074c">  126</a></span>&#160;__device__ __forceinline__ T <a class="code" href="group___thread_module.html#ga4004b2a6bfb2b4f024b0389e9c46074c" title="Perform a sequential inclusive prefix scan over LENGTH elements of the input array. The aggregate is returned. ">ThreadScanInclusive</a>(</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;    T           *input,                 </div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;    T           *output,                </div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;    ScanOp      scan_op)                </div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;{</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;    T inclusive = input[0];</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;    output[0] = inclusive;</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;    <span class="comment">// Continue scan</span></div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;<span class="preprocessor">    #pragma unroll</span></div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;<span class="preprocessor"></span>    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; LENGTH; ++i)</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;    {</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;        inclusive = scan_op(inclusive, input[i]);</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;        output[i] = inclusive;</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;    }</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;    <span class="keywordflow">return</span> inclusive;</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;}</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;<span class="keyword">template</span> &lt;</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;    <span class="keywordtype">int</span>         LENGTH,</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;    <span class="keyword">typename</span>    T,</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;    <span class="keyword">typename</span>    ScanOp&gt;</div>
<div class="line"><a name="l00157"></a><span class="lineno"><a class="code" href="group___thread_module.html#gae78193279081a554432b6aea10a7295a">  157</a></span>&#160;__device__ __forceinline__ T <a class="code" href="group___thread_module.html#ga4004b2a6bfb2b4f024b0389e9c46074c" title="Perform a sequential inclusive prefix scan over LENGTH elements of the input array. The aggregate is returned. ">ThreadScanInclusive</a>(</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;    T           (&amp;input)[LENGTH],       </div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;    T           (&amp;output)[LENGTH],      </div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;    ScanOp      scan_op)                </div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;{</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;    <span class="keywordflow">return</span> ThreadScanInclusive&lt;LENGTH&gt;((T*) input, (T*) output, scan_op);</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;}</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;</div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;<span class="keyword">template</span> &lt;</div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;    <span class="keywordtype">int</span>         LENGTH,</div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;    <span class="keyword">typename</span>    T,</div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;    <span class="keyword">typename</span>    ScanOp&gt;</div>
<div class="line"><a name="l00177"></a><span class="lineno"><a class="code" href="group___thread_module.html#ga0e00b3a9b522249581b2ff98f670087b">  177</a></span>&#160;__device__ __forceinline__ T <a class="code" href="group___thread_module.html#ga4004b2a6bfb2b4f024b0389e9c46074c" title="Perform a sequential inclusive prefix scan over LENGTH elements of the input array. The aggregate is returned. ">ThreadScanInclusive</a>(</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;    T           *input,                 </div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;    T           *output,                </div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;    ScanOp      scan_op,                </div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;    T           prefix,                 </div>
<div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;    <span class="keywordtype">bool</span>        apply_prefix = <span class="keyword">true</span>)    </div>
<div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;{</div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;    T inclusive = input[0];</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;    <span class="keywordflow">if</span> (apply_prefix)</div>
<div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;    {</div>
<div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;        inclusive = scan_op(prefix, inclusive);</div>
<div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;    }</div>
<div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;    output[0] = inclusive;</div>
<div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;</div>
<div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;    <span class="comment">// Continue scan</span></div>
<div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;<span class="preprocessor">    #pragma unroll</span></div>
<div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;<span class="preprocessor"></span>    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 1; i &lt; LENGTH; ++i)</div>
<div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;    {</div>
<div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;        inclusive = scan_op(inclusive, input[i]);</div>
<div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;        output[i] = inclusive;</div>
<div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;    }</div>
<div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;</div>
<div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;    <span class="keywordflow">return</span> inclusive;</div>
<div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;}</div>
<div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;</div>
<div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;</div>
<div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;<span class="keyword">template</span> &lt;</div>
<div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;    <span class="keywordtype">int</span>         LENGTH,</div>
<div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;    <span class="keyword">typename</span>    T,</div>
<div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;    <span class="keyword">typename</span>    ScanOp&gt;</div>
<div class="line"><a name="l00214"></a><span class="lineno"><a class="code" href="group___thread_module.html#gadb4aed8a804827b6fb97eca790572099">  214</a></span>&#160;__device__ __forceinline__ T <a class="code" href="group___thread_module.html#ga4004b2a6bfb2b4f024b0389e9c46074c" title="Perform a sequential inclusive prefix scan over LENGTH elements of the input array. The aggregate is returned. ">ThreadScanInclusive</a>(</div>
<div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;    T           (&amp;input)[LENGTH],       </div>
<div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;    T           (&amp;output)[LENGTH],      </div>
<div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;    ScanOp      scan_op,                </div>
<div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;    T           prefix,                 </div>
<div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;    <span class="keywordtype">bool</span>        apply_prefix = <span class="keyword">true</span>)    </div>
<div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;{</div>
<div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;    <span class="keywordflow">return</span> ThreadScanInclusive&lt;LENGTH&gt;((T*) input, (T*) output, scan_op, prefix, apply_prefix);</div>
<div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;}</div>
<div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;</div>
<div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;</div>
<div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;       <span class="comment">// end group ThreadModule</span></div>
<div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160;</div>
<div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160;</div>
<div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;}               <span class="comment">// CUB namespace</span></div>
<div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;CUB_NS_POSTFIX  <span class="comment">// Optional outer namespace(s)</span></div>
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